Phase Separation in the Aftermath of Subseafloor Magmatic Events: An Experimental Study of Processes of Acid-Generation, Aqueous Speciation, and Vapor-Phase Transport of Fe

海底岩浆事件后的相分离：酸生成、水相形成和铁的气相传输过程的实验研究

• 批准号: 0751771
• 负责人: William Seyfried
• 金额: $ 35.37万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-02-15 至 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751771&HistoricalAwards=false
• 关键词: Phase; Separation; Aftermath; Subseafloor; Magmatic

ABSTRACT-0751771 (Seyfried)Intellectual Merit: This research provides an integrated series of experiments that allow the assessment of liquid-vapor partitioning, acid generating processes, and the role of redox variation on vapor-transport of Fe in NaCl-bearing systems from 380 to 500 C and 250 to 350 bars. These are important for reactions in which hot geothermal waters interact with rocks, causing mineral dissolution and precipitation as well as the generation of deep hot brines. Experiments will build from a simple NaCl-H2O-HCl system to those that include Ca and Fe where hydrolysis effects that generate acidity can be examined. Vapor transport of Fe will be determined during a series of magnetite-bearing experiments with dissolved H2 at fixed values from 2 to 100 mm/kg and concentrations greater or equal to those observed in hydrothermal systems. For the work, a novel new reactor will be developed that permits sampling of vapor and brine phases and that is fitted with in-situ chemical sensors that allow the activity of HCl in the vapor phase to be determined. Aqueous speciation, vapor-liquid partitioning, and mineral solubility effects on the composition of vapors and brines will be determined. Broader Impacts: Broader impacts of the work include: the generation of essential data and parameters for use in a wide range of disciplines ranging from geothermal energy generation to earth science to chemical engineering to reactive transport modeling in high temperature water-rock systems. The development of the titanium reactor with in-situ chemical sensors is an important technological development and increases the infrastructure for science. The work also supports graduate and undergraduate training and the likelihood that students from groups whose gender or race is under-represented in the sciences will be engaged.

摘要：本研究提供了一系列完整的实验，可以评估液-气分配，酸生成过程，以及氧化还原变化对含nacl体系中铁在380 - 500℃和250 - 350 bar中的蒸汽传输的作用。这对于热地热水与岩石相互作用的反应很重要，这些反应导致矿物溶解和沉淀，以及产生深层热盐水。实验将从一个简单的NaCl-H2O-HCl系统建立到那些包含Ca和Fe的系统，在那里可以检查产生酸度的水解效应。铁的蒸气输运将在一系列含磁铁矿实验中测定，溶解H2的固定值为2至100 mm/kg，浓度大于或等于热液系统中观察到的浓度。为了这项工作，将开发一种新的反应器，可以对蒸汽和盐水相进行采样，并配有原位化学传感器，可以确定蒸汽相中HCl的活性。将确定水相形成、气液分配和矿物溶解度对蒸汽和盐水组成的影响。更广泛的影响：这项工作的更广泛的影响包括：生成用于广泛学科的基本数据和参数，从地热能发电到地球科学，从化学工程到高温水岩系统的反应输运建模。原位化学传感器钛反应器的开发是一项重要的技术发展，增加了科学基础设施。这项工作还支持研究生和本科生的培训，以及来自性别或种族在科学领域代表性不足的群体的学生参与的可能性。